Abstract
AbstractWe report on a photobioelectrochemical fuel cell consisting of a glucose‐oxidase‐modified BiFeO3photobiocathode and a quantum‐dot‐sensitized inverse opal TiO2photobioanode linked to FAD glucose dehydrogenase via a redox polymer. Both photobioelectrodes are driven by enzymatic glucose conversion. Whereas the photobioanode can collect electrons from sugar oxidation at rather low potential, the photobiocathode shows reduction currents at rather high potential. The electrodes can be arranged in a sandwich‐like manner due to the semi‐transparent nature of BiFeO3, which also guarantees a simultaneous excitation of the photobioanode when illuminated via the cathode side. This tandem cell can generate electricity under illumination and in the presence of glucose and provides an exceptionally high OCV of about 1 V. The developed semi‐artificial system has significant implications for the integration of biocatalysts in photoactive entities for bioenergetic purposes, and it opens up a new path toward generation of electricity from sunlight and (bio)fuels.
Highlights
We report on a photobioelectrochemical fuel cell consisting of a glucose-oxidase-modified BiFeO3 photobiocathode and a quantum-dot-sensitized inverse opal TiO2 photobioanode linked to FAD glucose dehydrogenase via a redox polymer
The final BiFeO3 j glucose oxidase (GOx) photobiocathode is coupled to a glucose converting photobioanode in a photobioelectrochemical tandem cell (PBTC) set-up, enabling the generation of energy with high cell voltages under illumination and in the presence of biofuel
Illustration of the photobioelectrochemical tandem cell consisting of a BiFeO3 j GOx photobiocathode and an inverse opal (IO)-TiO2 j PbSj POs j FAD glucose dehydrogenase (FAD-GDH) photobioanode, and the proposed electron transfer steps of the signal chain under illumination and in the presence of glucose
Summary
We report on a photobioelectrochemical fuel cell consisting of a glucose-oxidase-modified BiFeO3 photobiocathode and a quantum-dot-sensitized inverse opal TiO2 photobioanode linked to FAD glucose dehydrogenase via a redox polymer. The final BiFeO3 j GOx photobiocathode is coupled to a glucose converting photobioanode in a photobioelectrochemical tandem cell (PBTC) set-up, enabling the generation of energy with high cell voltages under illumination and in the presence of biofuel.
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